Psoroptidia is a parvorder of the Acari (mite) group Astigma (or Astigmatina).

[1] It comprises around 40 families, and apparently originated as parasites of birds, before a secondary radiation saw some taxa become parasites of mammals.

[2] Because of their parasitic lifestyle, members of the Psoroptidia do not exhibit a deutonymph stage.

[3] The group contains many of the more notorious parasitic members of the Astigmata.

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